Should I tell her I like her?

so this girl I like I want to tell her I like her should I say "I like you a lot and im willing to work for it cause I want to be with you. I'm telling you this so you can tell me if I'm wasting my time but I don't want you to tell me now I want you to think about it first so you know for sure if you're making the right decision now go to class ill see you next period" or something like that I just want to know if I should say that or like make it shorter or sum?

Should I tell her I like her?
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